Method of manufacturing metal dials



Filed August 31, 1925 FIG. 4. F1615.

Patented Aug. 31, 1926.

entree stares NUMA TRIPET AND ALFRED JEANRENAUD, 033 LA CHAUK-DE-FONDS, SWITZERLAND.

METHOD OF MANUFACTURING METAL DIALSi Application filed August 31, 1925, Serial No. 53,762, and in Switzerland fieptember 11, 1924:.

Hitherto the embossed dial characters of the metal and the luminous substance type were generally made in such a manner that a channel-shaped figure (see Fig. 4: and Fig. 5 which is a section of the former along; the line VV) was at first fashioned separately and secured to the dial in proper position after having undergone the previous stamping operations.

Our device is by far more simple: Its distinctive feature is that one stamping operation will be suflicient to fashion, for each cha ncter marking the hours, a channel which, projecting beyond and making one body with the dial, has the outer outline of said character and is afterward filled with a substance of another kind, such as enamel.

The accompanying drawing; illustrates one manner in which the invention is employed. Fig. 1 is a front view of adial; Fig. 2 is a section through it along the line H ll of 1; Fig. 3 is a similar section but on a larger scale; Fig. 4 is an enlarged plan View of a pre-formed index figure of the type hitherto used in making watch dials; Fig. 5, is a section taken through the index figure shown in Fig. 4.

a represents the bed-plate of the dial, whilst Z) are the figures marking the hours from 1 to 12 and 0 the graduations showing the minutes; each figure and each graduation is formed from a channel-shaped or 40 cup-shaped projection filled out with a material e which may be, e. g. either enamel or any substance luminous in the dark. All outlines d are made in one stamping; operation carried out on the plate a; this single 5 operation provides flanged outlines or channels (Z which will be arranged directly on the plate a in the predetermined position. The stamping once completed, the frames are filled with either enamel or any substance luminous in the dark.

We claim:

1. The method of manufacturing; metal dials which consists in stamping a dial to provide said dial with indices, each of said indices consisting of a channeled outline projecting from the surface of the dial and filling the channels with a substance differing from the metal of the dial.

2. The method of manufacturing metal dials which consists in stamping a dial to provide said dial with indices, each of said indices consisting); of a channeled outline projecting from the surface of the dial, and filling the channels with an enamel.

In testimony whereof we aliir; our signatures.

NUMA TRIP ET. ALFRED JEANRENAUD. 

